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Lateral Fluid Percussion: Model of Traumatic Brain Injury in Mice
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Meningeal lymphatic dysfunction exacerbates traumatic brain injury pathogenesis.

Ashley C Bolte1,2,3,4, Arun B Dutta3,5, Mariah E Hurt1

  • 1Center for Brain Immunology and Glia (BIG), Department of Neuroscience, University of Virginia, Charlottesville, VA, 22908, USA.

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|September 11, 2020
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Traumatic brain injury (TBI) impairs lymphatic drainage in the brain, leading to neuroinflammation and cognitive deficits. Restoring lymphatic function may offer new TBI treatment strategies.

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Area of Science:

  • Neuroscience
  • Immunology
  • Vascular Biology

Background:

  • Traumatic brain injury (TBI) is a major cause of death and disability worldwide.
  • The role of the meningeal lymphatic system in TBI pathogenesis is not well understood.

Purpose of the Study:

  • To investigate the impact of TBI on meningeal lymphatic drainage.
  • To explore the mechanisms linking intracranial pressure (ICP) to lymphatic dysfunction post-TBI.
  • To assess the consequences of lymphatic dysfunction and potential therapeutic benefits of restoring drainage.

Main Methods:

  • Utilized an experimental mouse model of TBI.
  • Assessed meningeal lymphatic drainage function at various time points post-injury.
  • Investigated the effects of increased intracranial pressure on lymphatic vessels.
  • Examined neuroinflammation, cognitive outcomes, and gliosis in relation to lymphatic function.

Main Results:

  • Mild TBI caused severe, long-lasting deficits in meningeal lymphatic drainage.
  • Increased intracranial pressure was identified as a contributing factor to lymphatic dysfunction.
  • Pre-existing lymphatic dysfunction exacerbated neuroinflammation and cognitive impairments after TBI.
  • Rejuvenating lymphatic drainage in aged mice ameliorated TBI-induced gliosis.

Conclusions:

  • Meningeal lymphatic dysfunction is a significant consequence of TBI.
  • Targeting the meningeal lymphatic system presents a potential therapeutic avenue for TBI.
  • Restoring lymphatic function may mitigate negative outcomes associated with brain trauma.